The agents spotted two suspected smugglers wearing large backpacks about 11:45 p.m. walking near the border, officials said. The men tried to hide inside a GM Safari parked by the trailer, but were soon detained, officials said.

A drug-sniffing dog alerted to drugs in the trailer, and agents found 73 bundles of marijuana weighing 400 pounds.

The drugs and suspects were turned over to the regional Narcotics Task Force, and the vehicle was impounded by Border Patrol.